the 621679R utilizes standard 1/4" quick-connect spade lugs for direct integration into existing control boards

ensuring that Building Automation Systems (BAS) receive accurate feedback and command responses

This genuine OEM furnace high limit switch is engineered to maintain system integrity by monitoring internal plenum temperatures

If the compressor is humming but failing to turn over

and PFG series

Lennox 71J07 Limit Switch the 621679R utilizes standard 1/4"The Lennox 71J07 Limit Switch is a high precision, normally closed safety component designed for critical temperature regulation in heating systems. Engineered by Therm O Disc (Model 36TX11, 36T series), this disc style limit switch features an automatic reset function that ensures seamless system recovery once temperatures stabilize. With an open temperature threshold of 175F and a close temperature of 155F, this L175 20 limit switch effectively